Abstract: A dehumidifier for air is provided. The dehumidifier includes a housing with an inlet for process air, an outlet for process air, and an opening for regeneration air. The dehumidifier includes a dehumidification element, a fan for bringing process air to flow through at least a first portion of the dehumidification element, and a heating element to heat a part of process air flowing through the dehumidification element for regeneration of the dehumidification element by using the heated process air. A controller controls the amount of air that flows though the outlet for process air and the opening for regeneration air and the sensor/meter to calculate consumed power for the heating element, wherein the heating element is a PTC heater. The controller allows a user in a simple way to adjust the operating parameters to a desired operating mode.

Abstract: An apparatus for dehumidification of air comprises a housing (2) provided with an inlet (3) for process air, an outlet (4) for process air and an opening (17) for regeneration air, a dehumidification element (6), a fan (10) for bringing process air to flow through at least a first portion of the dehumidification element, and a heating element (15) adapted to heat a part of process air flowing through the dehumidification element for regeneration of the dehumidification element by means of the heated process air. By providing control means (4a, 10, 17a, 17b) adapted to control the amount of air that flows though the outlet (4) for process air and the opening (17) for regeneration air and means (6b, 15a; 25) adapted to calculate consumed power for the heating element, wherein the heating element (15) is a PTC heater, a user can in a simple way adjust the operating parameters to a desired operating mode.